WO2005005971A1 - 流量・液種検知装置および流量・液種検知方法、ならびに、液種検知装置および液種検知方法 - Google Patents
流量・液種検知装置および流量・液種検知方法、ならびに、液種検知装置および液種検知方法 Download PDFInfo
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- WO2005005971A1 WO2005005971A1 PCT/JP2004/009853 JP2004009853W WO2005005971A1 WO 2005005971 A1 WO2005005971 A1 WO 2005005971A1 JP 2004009853 W JP2004009853 W JP 2004009853W WO 2005005971 A1 WO2005005971 A1 WO 2005005971A1
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- Prior art keywords
- liquid type
- type detection
- flow rate
- fluid
- detected
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/6965—Circuits therefor, e.g. constant-current flow meters comprising means to store calibration data for flow signal calculation or correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F7/00—Volume-flow measuring devices with two or more measuring ranges; Compound meters
Definitions
- the present invention relates to a flow rate detecting apparatus and a flow rate / liquid type detecting method for detecting a type, a concentration, and a flow rate of a fluid such as an organic solution such as gasoline, light oil, or a plant as a fuel in an automobile, Also, the present invention relates to a liquid type detection device and a liquid type detection method.
- exhaust gas of automobiles contains pollutants such as unburned hydrated carbon (HC), NOx gas, and SOx gas, for example, in order to reduce this, for example, S At ⁇ x, sulfur in gasoline is removed, and unburned HC is reduced by burning it with a catalyst.
- pollutants such as unburned hydrated carbon (HC), NOx gas, and SOx gas, for example, in order to reduce this, for example, S At ⁇ x, sulfur in gasoline is removed, and unburned HC is reduced by burning it with a catalyst.
- an automobile system 100 takes in air with an automatic element (filter) 102 and sends it to an engine 106 via an air flow sensor 104.
- gasoline in a fuel tank 108 is supplied to an engine 106 via a fuel pump 110.
- the fuel injection in the engine 106 is controlled by the fuel injection control device 114 so as to achieve a predetermined stoichiometric air-fuel ratio.
- Exhaust gas from the engine 106 is configured to be discharged as exhaust gas via an oxygen concentration sensor 118 after the hide port carbon (HC) in the exhaust gas is burned by the catalyst device 116. Has become.
- FIG. 18 shows the distillation properties of gasoline, and the relationship between percent and temperature, for example, at 50% (T50) on the horizontal axis, 50% of various gasoline evaporates The temperature indicates what ° C.
- A2 gasoline indicates the heaviest (evaporable) gasoline
- No. 7 gasoline indicates the lightest Gasoline (evaporable).
- Patent Document 1 Japanese Patent Application Laid-Open No. 11-153561
- the present inventors have already made the heating element generate heat by energization, and heat the temperature sensing element by the heat generation, and A fluid detection method that has a thermal effect on the heat transfer to the body by the fluid to be detected, and determines the type of the fluid to be detected based on the electrical output corresponding to the electrical resistance of the thermosensitive body.
- a method of periodically energizing the body is proposed.
- the urea solution tank 132 for storing the urea solution, the urea pump 134, and the urea solution A urea solution is supplied to the upstream side of the catalyst device 116 via a urea solution supply mechanism 130 composed of a urea spray device 136 that sprays the urea solution upstream of the catalyst device 116.
- N ⁇ x N ⁇ x
- the NOx sensors 140 and 142 measure the urea concentration based on the result of the NOx reduction rate, it is impossible to detect the urea concentration in the urea solution tank 132 or the urea sprayed in advance. It is. The sensitivity of the NOx sensors 140 and 142 was not very good.
- the engine and the catalyst device are controlled by grasping the gasoline flow rate, the liquid type, the flow rate and concentration of the urea solution, It is important to reduce NOx and NOx.
- Patent Document 2 Japanese Patent Application Laid-Open No. 11-118566 discloses an indirectly heated flow sensor using a thin-film element. There has been proposed a thermal type flow sensor which uses an electric circuit including a bridge circuit to obtain a corresponding electric output and detects a flow rate of a fluid to be detected by a voltage applied to a heating element.
- a detection device for detecting the type of gasoline as described above and a urea solution concentration are measured. It is necessary to separately provide a flow velocity measuring device as disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. H11-118566) in addition to the device described above, so that the system may be increased in size.
- Patent Document 1 JP-A-11-153561 (particularly, see paragraph [0042], paragraph [0049])
- Patent Document 2 JP-A-11-118566
- the present invention is a compact, accurate, and quickly capable fluid flow rate and liquid type capable of detecting the liquid type and concentration of the fluid at the same time as detecting the flow rate of the fluid. It is an object of the present invention to provide a flow rate 'liquid type detection device and a flow rate' liquid type detection method capable of detecting a concentration.
- the present invention provides an automobile flow rate “liquid type detection apparatus and an automobile flow rate” liquid type detection method using such a flow rate “liquid type detection device and flow rate” liquid type detection method. Aim.
- the present invention provides an automobile exhaust gas that can use such a flow rate 'liquid type detection device and a flow rate' liquid type detection method and can efficiently reduce exhaust gas and improve fuel efficiency. It is an object of the present invention to provide an apparatus for reducing the amount of exhaust gas and a method for reducing the exhaust gas of an automobile.
- the present invention provides a liquid type detection device and a liquid type detection method that are compact, capable of accurately detecting the liquid type and concentration of a fluid quickly and with high power.
- the purpose is to do.
- the present invention provides an exhaust gas using such a liquid type detection device and a liquid type detection method. It is an object of the present invention to provide a vehicle exhaust gas reduction device and a vehicle exhaust gas reduction method capable of efficiently reducing fuel consumption and improving fuel efficiency.
- the present invention has been made in order to achieve the above-described problems and objects in the related art, and the flow rate 'liquid type detection device of the present invention detects the flow rate of a fluid and , A liquid type detection device for detecting one or both of a liquid type detection and a concentration detection of a fluid,
- a sub-flow path opening / closing valve provided in the sub-flow path and controlling the flow of the detected fluid to the flow rate 'liquid type detection sensor device;
- the sub flow path opening / closing valve When performing one or both of the liquid type detection and the concentration detection of the fluid to be detected, the sub flow path opening / closing valve is closed, and the fluid to be detected is placed in the flow rate / liquid type detection sensor device.
- the liquid type detection and / or the concentration detection are performed, and when the flow rate of the fluid to be detected is detected, the sub-channel opening / closing valve is opened to detect the flow rate of the detected fluid.
- the apparatus is characterized in that the fluid is configured to flow through the liquid type detection sensor device to control the flow rate so as to be detected.
- the flow rate 'liquid type detection method of the present invention detects the flow rate of the fluid and detects the flow rate of the fluid and / or the concentration of the fluid.
- Closing the sub-channel opening / closing valve When performing liquid type detection, concentration detection, or both of the detected fluid, Closing the sub-channel opening / closing valve, temporarily suspending the fluid to be detected in the flow rate / liquid type detection sensor device, and performing one or both of liquid type detection and concentration detection; When detecting the flow rate of the fluid to be detected, the sub flow path opening / closing valve is opened to allow the fluid to be detected to flow through the liquid type detection sensor device to detect the flow rate. I do.
- the sub-channel opening / closing valve is closed to flow the detection target fluid at a flow rate. 'They temporarily stay in the liquid type detection sensor device, so that either liquid type detection or concentration detection, or both, can be performed accurately and quickly.
- the sub-flow path on-off valve is opened to allow the fluid to be detected to flow through the flow rate type liquid type sensor device to detect the flow rate. be able to.
- the system is compact. For example, if it is applied to an automobile system, the whole system can be made compact.
- the present invention is characterized in that a check valve is arranged downstream of the flow rate of the sub flow path and the liquid type detection sensor device.
- the check valve By disposing the check valve on the downstream side of the flow rate of the sub flow path and the liquid type detection sensor device as described above, for example, depending on the type of a pump which is a liquid sending device for flowing a fluid and the type of a driving system, In the case where a pulsating flow occurs and a backflow occurs, the backflow can be suppressed.
- the flow rate of the fluid in the liquid type detection sensor device can be prevented, so that the liquid type detection, the concentration detection, and the flow rate detection are not affected by the fluid back flow.
- the present invention is characterized in that a main flow path opening / closing valve is provided in the main flow path and controls the flow of the fluid to be detected to the main flow path.
- control device may include:
- the main flow path on-off valve When the flow rate of the detected fluid is small, the main flow path on-off valve is closed, When the flow rate of the fluid to be detected is large, the main flow path on-off valve is controlled so as to be opened.
- the flow rate 'liquid type detection method of the present invention when the flow rate of the fluid to be detected is small, closes the main flow path opening and closing valve,
- control is performed such that the main flow path on-off valve is opened.
- the fluid to be detected flows through the sub-flow path by closing the main flow path on-off valve, and the flow rate is detected by the liquid type detection sensor device.
- the required flow rate of the fluid can be secured.
- the main flow path opening / closing valve is opened to flow the fluid through the main flow path, thereby reducing the flow rate of the fluid flowing through the sub flow path, -The flow rate of the fluid required for detection by the liquid type detection sensor device can be secured.
- the present invention is characterized in that an orifice is provided in the main flow path.
- the orifice is provided in the main flow path, when the pressure loss in the main flow path is small and the fluid does not easily flow in the sub flow path, the pressure loss in the main flow path is increased by the orifice. As a result, a constant flow rate of fluid required for detection can be caused to flow through the sub-flow path, and the above-described detection can be reliably performed.
- the flow rate' liquid type detection sensor device may be configured to temporarily hold the fluid to be detected introduced into the flow type liquid type detection sensor device body.
- the flow rate 'liquid type detection sensor heater is disposed near the heater and the heater. And a liquid temperature sensor for liquid type detection.
- a pulse voltage is applied to the heater for detecting the flow rate of the liquid type for a predetermined time, and the heater performs the above-described operation.
- Flow rate The fluid to be detected temporarily staying in the liquid type detection chamber is heated, and the flow rate is determined by the voltage output difference V0 corresponding to the temperature difference between the initial temperature and the peak temperature of the liquid temperature sensor for liquid type detection. It is configured to perform species detection, concentration detection, or both, and
- a pulse voltage is applied to the flow rate 'liquid type detection sensor heater for a predetermined period of time, and the heater detects the flow rate of the detected fluid flowing through the flow rate' liquid type detection chamber. And the flow rate is detected by the voltage output difference V0 corresponding to the temperature difference between the initial temperature and the peak temperature of the liquid type detection liquid temperature sensor.
- the flow rate' liquid type detection sensor device may include a flow amount, a flow amount and a liquid type detection chamber for temporarily retaining the fluid to be detected introduced into the liquid type detection sensor device main body.
- the flow rate 'liquid type detection sensor heater includes a heater, and a flow rate / liquid type detection liquid temperature sensor disposed near the heater;
- a pulse voltage is applied to the heater for detecting the flow rate of the liquid type for a predetermined time, and the heater performs the above-described operation.
- Flow rate The fluid to be detected temporarily staying in the liquid type detection chamber is heated, and the flow rate is determined by the voltage output difference V0 corresponding to the temperature difference between the initial temperature and the peak temperature of the liquid temperature sensor for liquid type detection. Detects species detection, concentration detection, or both, and
- a pulse voltage is applied to the flow rate 'liquid type detection sensor heater for a predetermined time, and the heater causes the flow rate' liquid type detection chamber.
- the fluid to be detected flowing through the inside is heated, and the flow rate is detected by a voltage output difference V0 corresponding to a temperature difference between an initial temperature and a peak temperature of the liquid temperature sensor for detecting the flow rate.
- the type of fluid can be accurately and quickly determined. It is possible to detect the concentration and the flow rate of the fluid.
- the voltage output difference V0 is defined as an average initial voltage VI obtained by sampling the initial voltage before applying the pulse voltage a predetermined number of times, and a peak voltage after applying the pulse voltage.
- V0 V2-V1
- the voltage output difference V0 can be accurately obtained based on the average value of a predetermined number of samplings with respect to the applied voltage of one pulse. Type, concentration, and fluid flow rate can be detected.
- control device may include a calibration curve data which is a correlation of a voltage output difference with respect to temperature for a predetermined reference fluid stored in the control device in advance.
- the gasoline flow rate 'liquid type detection method of the present invention uses the calibration curve data, which is the correlation of the voltage output difference with respect to temperature, for a predetermined reference fluid stored in advance.
- the detected fluid According to the voltage output difference V0 obtained for the detected fluid, the detected fluid And / or both of the liquid type detection and the concentration detection.
- the voltage output difference obtained for the fluid to be detected is obtained based on the calibration curve data that is the correlation between the voltage output difference and the temperature for the predetermined reference fluid stored in advance. Since V0 detects the type and concentration of the fluid, it is possible to more accurately and quickly detect the type and concentration of the fluid.
- control device may control the voltage output Vout for the voltage output difference V0 at the measured temperature of the fluid to be detected
- the apparatus is characterized in that it is configured so as to be correlated with an output voltage of a voltage output difference at a measured temperature of a predetermined threshold reference fluid and to correct the voltage output difference.
- the voltage output Vout with respect to the voltage output difference V0 at the measurement temperature of the fluid to be detected is calculated as follows:
- the apparatus is characterized in that it is configured so as to be correlated with an output voltage of a voltage output difference at a measured temperature of a predetermined threshold reference fluid and to correct the voltage output difference.
- the voltage output Vout for the voltage output difference V0 at the measurement temperature of the fluid to be detected is correlated with the output voltage for the voltage output difference at the measurement temperature for the predetermined threshold reference fluid. Correction, the voltage output Vout can be more accurately correlated with the properties of gasoline without the effect of the voltage output difference V0 due to temperature, and more accurately and quickly, the fluid type, concentration, and It is possible to detect the flow rate of the fluid.
- control device may include a calibration curve data that is a correlation of a voltage output difference with respect to temperature for a predetermined reference fluid stored in the control device in advance.
- the flow rate of the fluid to be detected is detected based on the voltage output difference V0 obtained for the fluid to be detected.
- the flow rate 'liquid type detection method of the present invention obtains the detected fluid based on calibration curve data that is a correlation between a voltage output difference and a temperature for a predetermined reference fluid stored in advance.
- the flow rate of the fluid to be detected is detected based on the obtained voltage output difference V0.
- V0 detects the flow rate of the fluid, it is possible to more accurately and quickly detect the flow rate of the fluid.
- the present invention provides a laminated flow rate / liquid type detection sensor heater in which the flow rate 'liquid type detection sensor heater is laminated with a heater and a flow rate' liquid type detection liquid temperature sensor via an insulating layer. It is characterized by being.
- the sensor unit can be configured to be extremely small, it is possible to detect the type, concentration, and flow rate of the fluid with extremely good thermal responsiveness and accurately.
- the present invention is configured such that the heater of the flow rate 'liquid type detection sensor heater and the flow rate' liquid type detection liquid temperature sensor are respectively in contact with the fluid to be detected via metal fins. It is characterized by checking.
- the liquid type detection liquid temperature sensor does not directly contact the fluid to be detected. It is possible to accurately and quickly detect the type and concentration of the fluid and the flow rate of the fluid without causing an operation failure due to, for example, the operation failure.
- the present invention is characterized in that the liquid temperature sensor is configured to be in contact with the fluid to be detected via a metal fin.
- the liquid temperature sensor does not directly come into contact with the fluid to be detected, so that the fluid temperature sensor accurately and promptly prevents the malfunction due to deterioration over time and foreign substances in the fluid.
- the type, concentration, and flow rate of the fluid can be detected.
- the vehicle flow rate 'liquid type detection device of the present invention is a vehicle flow rate' liquid type detection device for detecting the flow rate and type of gasoline or light oil
- the method for detecting a flow rate of a vehicle is a method for detecting a flow rate of a gasoline or light oil, and a method of detecting a flow rate of a vehicle.
- the gasoline in the fuel tank or on the upstream or downstream side of the fuel pump is characterized by detecting the flow rate and type of gasoline or light oil using any of the above-described flow rate / liquid type detection methods.
- the vehicle exhaust gas reducing device of the present invention is a vehicle exhaust gas reducing device
- Either of the above flow rate / liquid type detection devices is installed in the fuel tank or upstream or downstream of the fuel pump.
- An ignition timing control device is provided for adjusting the ignition timing based on the flow rate and type of gasoline or light oil detected by the flow rate / liquid type detection device.
- the method for reducing exhaust gas of an automobile according to the present invention is a method for reducing exhaust gas of an automobile.
- the gasoline or light oil in the fuel tank or the upstream or downstream of the fuel pump is supplied to the gasoline or light oil using one of the above-mentioned liquid type detection methods.
- the ignition timing is adjusted based on the flow rate and type of gasoline or light oil detected by the flow rate / liquid type detection device.
- the ignition timing can be adjusted based on the detection result of the flow rate and type of gasoline or light oil, so that an appropriate ignition timing can be set according to the flow rate and type of gasoline or light oil. Obtainable.
- the exhaust gas reducing device for an automobile of the present invention is an exhaust gas reducing device for an automobile, In the fuel tank or upstream or downstream of the fuel pump, one of the above flow rate and liquid type detection devices is installed, and
- a gasoline or light oil compression control device that adjusts the compression rate of gasoline or light oil based on the flow rate and type of gasoline or light oil detected by the flow rate / liquid type detection device.
- the method for reducing automobile exhaust gas of the present invention is a method for reducing automobile exhaust gas
- the gasoline in the fuel tank or the upstream or downstream side of the fuel pump is detected using one of the above-mentioned flow rate and liquid type detection methods to detect the flow rate and type of gasoline or light oil.
- the compression rate of gasoline is adjusted based on the flow rate and type of gasoline or light oil detected by the flow rate / liquid type detection device.
- the compression ratio of gasoline or light oil can be adjusted based on the detection result of the flow rate and type of gasoline or light oil. Therefore, appropriate gasoline or light oil can be adjusted according to the type of gasoline. Can be obtained.
- the exhaust gas reducing device for an automobile of the present invention is an exhaust gas reducing device for an automobile.
- a urea solution supply mechanism for supplying a urea solution upstream of the catalyst device, wherein the urea solution supply mechanism catalyzes a urea solution fed from the urea pump, a urea solution tank storing the urea solution, and a urea pump. And a urea spraying device that sprays on the upstream side of the device.
- the flow rate / liquid type detection device of the above (1) or (2) is disposed in the urea tank or upstream or downstream of the urea pump.
- the method for reducing exhaust gas of an automobile is a method for reducing exhaust gas of an automobile,
- a urea solution supply mechanism configured by a urea solution tank that stores a urea solution, a urea pump, and a urea spray device that sprays the urea solution fed from the urea pump upstream of the catalyst device. Supply the urea solution upstream of the
- the flow rate and the urea concentration of the urea solution in the urea tank or on the upstream or downstream side of the urea pump are detected by using any one of the flow rate / liquid type detection methods described above.
- the urea concentration of the urea solution in the urea tank can be maintained at a predetermined concentration.
- N ⁇ x in exhaust gas can be reduced to a very low level.
- the present invention has been made in order to achieve the above-mentioned problems and objects in the prior art, and the liquid type detection device of the present invention is capable of detecting a liquid type and a concentration of a fluid.
- a liquid type detection chamber for temporarily retaining the detected fluid introduced into the liquid type detection device main body, and a liquid type detection sensor disposed in the liquid type detection chamber,
- a flow control plate disposed in the liquid type detection chamber and surrounding the liquid type detection sensor.
- the liquid type detection method of the present invention is a liquid type detection method for detecting one or both of the liquid type detection and the concentration detection of a fluid
- a liquid type detection chamber for temporarily retaining the detected fluid introduced into the liquid type detection device main body, and a liquid type detection sensor disposed in the liquid type detection chamber,
- a liquid type detection device disposed in the liquid type detection chamber and having a flow control plate surrounding the liquid type detection sensor;
- the introduction of the detection target fluid into the liquid type detection device main body is stopped, and the detection target fluid is temporarily retained in the liquid type detection chamber, and either the liquid type detection or the concentration detection of the detection target fluid or the detection thereof is performed. It is characterized by performing both.
- the liquid type detection chamber is provided, the amount of the fluid to be detected stays large, so that when detecting the liquid type and concentration of the fluid to be detected, the influence of ambient temperature and the like on the outside is affected. Accurate detection can be performed without being performed.
- the flow control plate may include a fluid inlet facing the fluid inlet of the liquid type detection chamber and a fluid outlet facing the fluid outlet of the liquid type detection chamber. It is a special feature that it is formed and laid.
- the detection target fluid flows from the fluid introduction port of the liquid type detection chamber to the inside of the flow control plate surrounded by the flow control plate via the fluid inlet of the flow control plate.
- the liquid can reliably enter the periphery of the liquid type detection sensor located inside the flow control plate, and the liquid type and concentration of the fluid to be detected can be detected by the liquid type detection sensor.
- the detected liquid is detected from the fluid outlet of the liquid type detection chamber through the fluid outlet of the flow control plate. Since the fluid to be detected can be reliably discharged, it is possible to sequentially and accurately detect the fluid to be detected.
- the fluid inlet of the liquid type detection chamber and the fluid inlet of the flow control plate are separated by a predetermined distance
- a fluid outlet of the liquid type detection chamber and a fluid outlet of the flow control plate are separated by a predetermined distance.
- the present invention is characterized in that the side wall near the fluid outlet of the liquid type detection chamber is formed in a substantially arc shape.
- the side wall near the fluid discharge port of the liquid type detection chamber is formed in a substantially circular arc shape, the side wall of the liquid type detection chamber is mixed with the detected fluid along the side wall of the substantially circular liquid type detection chamber. The discharged air is guided to the fluid discharge port of the liquid type detection chamber and discharged.
- the liquid type detection chamber has a substantially cylindrical side wall, and a fluid inlet and a fluid outlet of the liquid type detection chamber are formed so as to face the side wall.
- the liquid type detection chamber includes the substantially circular tube-shaped side wall, and the liquid type detection chamber faces the side wall. Since the fluid introduction port and the fluid discharge port of the sensing chamber are formed, air entering from the fluid introduction port of the liquid type detection chamber follows the substantially arc-shaped side wall near the fluid introduction port of the liquid type detection chamber. Therefore, since the air is guided to the outside, the air does not flow into the inside of the flow control plate through the fluid inlet of the flow control plate.
- the air mixed into the detected fluid is guided to the inside toward the fluid discharge port along the substantially arc-shaped side wall near the fluid discharge port of the liquid type detection chamber.
- the liquid is guided and discharged to the fluid discharge port of the liquid type detection chamber.
- the present invention is characterized in that a heat insulating member is interposed between the liquid type detection device main body and the liquid type detection chamber.
- the heat insulating member is interposed between the liquid type detecting device main body and the liquid type detecting chamber, the influence of the outside air temperature, the effect of external vibration, and the external Since the influence S due to the noise does not affect the liquid detection sensor inside the liquid type detection chamber and the liquid type detection sensor, it is possible to always accurately detect the liquid type and concentration of the liquid to be detected.
- the present invention when the present invention is applied to the detection of gasoline and light oil in automobiles, the difference in temperature between winter and summer, the temperature difference due to direct sunlight or snow, the influence of external noise such as electromagnetic waves, and the running
- This thermal insulation member can prevent the sensor from being affected by vibrations, impacts of stones, etc., and can always accurately detect the liquid type and concentration of the fluid to be detected.
- the present invention provides the liquid type detection sensor
- a liquid type detection sensor heater disposed in the liquid type detection chamber
- a liquid temperature sensor disposed in the liquid type detection chamber at a predetermined interval from the liquid type detection sensor heater;
- the liquid type detection sensor heater includes a heater, and a liquid type detection liquid temperature sensor disposed near the heater;
- a pulse voltage is applied to the liquid type detection sensor heater for a predetermined time, and the liquid type detection chamber is applied by the heater.
- the liquid to be detected temporarily stays at a temperature, and the voltage output difference V0 corresponding to the temperature difference between the initial temperature and the peak temperature of the liquid type detection liquid temperature sensor causes any one of liquid type detection and concentration detection. Or, it is configured to perform both of them.
- the type of fluid can be accurately and quickly determined. It is possible to detect the density.
- the voltage output difference V0 can be accurately obtained based on the average value of a predetermined number of samplings with respect to the applied voltage of one pulse. Type and density can be detected.
- the present invention is based on calibration curve data that is a correlation between a voltage output difference and a temperature for a predetermined reference fluid stored in advance.
- the voltage output difference obtained for the fluid to be detected is obtained based on the calibration curve data that is the correlation between the voltage output difference and the temperature for the predetermined reference fluid stored in advance.
- V0 detects the type and concentration of fluid. It is possible to accurately and quickly detect the type and concentration of the fluid.
- the present invention provides a voltage output Vout for a voltage output difference V0 at a measurement temperature of the fluid to be detected
- the apparatus is characterized in that it is configured so as to be correlated with an output voltage of a voltage output difference at a measured temperature of a predetermined threshold reference fluid and to correct the voltage output difference.
- the voltage output Vout for the voltage output difference V0 of the detected fluid at the measurement temperature is correlated with the output voltage for the voltage output difference at the measurement temperature of the predetermined threshold reference fluid. Compensation, so the voltage output Vout can be more accurately correlated with the gasoline properties without the effect of temperature-dependent voltage output difference V0, and the fluid type and concentration can be detected more accurately and quickly. can do.
- the present invention is characterized in that the liquid type detection sensor heater is a laminated liquid type detection sensor heater in which a heater and a liquid type detection liquid temperature sensor are laminated via an insulating layer. I do.
- the sensor section can be configured to be extremely small, the type and concentration of the fluid can be accurately detected with extremely good thermal response.
- the present invention is configured such that the heater of the liquid type detection sensor heater and the liquid type detection liquid temperature sensor are respectively in contact with the fluid to be detected via metal fins. It is characterized by.
- the heater of the liquid type detection sensor heater and the liquid type detection liquid temperature sensor do not directly contact the fluid to be detected.
- the present invention is characterized in that the liquid temperature sensor is configured to be in contact with the fluid to be detected via a metal fin.
- the liquid temperature sensor does not directly contact the fluid to be detected.
- the type and concentration of the fluid can be detected accurately and quickly without causing malfunction due to deterioration with time or foreign substances in the fluid.
- the liquid type detection device for a vehicle of the present invention is a liquid type detection device for a vehicle that detects the type of gasoline or light oil
- the liquid type detection device according to any one of claims 1 to 12 is provided inside the fuel tank or upstream or downstream of the fuel pump.
- the liquid type detection method for a vehicle according to the present invention is a liquid type detection method for a vehicle that detects the type of gasoline or light oil
- the vehicle exhaust gas reducing device of the present invention is a vehicle exhaust gas reducing device.
- Either of the above liquid type detection devices is installed in the fuel tank or upstream or downstream of the fuel pump,
- An ignition timing control device which adjusts the ignition timing based on the type of gasoline or light oil detected by the liquid type detection device.
- the method for reducing automobile exhaust gas of the present invention is a method for reducing automobile exhaust gas.
- the type of gasoline or light oil in gasoline or light oil in the fuel tank or on the upstream or downstream side of the fuel pump is detected using any of the above liquid type detection methods.
- the ignition timing is adjusted based on the type of gasoline or light oil detected by the liquid type detection device.
- the ignition timing can be adjusted based on the detection result of the flow rate and type of gasoline or light oil. Accordingly, appropriate ignition timing can be obtained.
- the vehicle exhaust gas reducing device of the present invention is a vehicle exhaust gas reducing device
- Either of the above liquid type detection devices is installed in the fuel tank or upstream or downstream of the fuel pump,
- a gasoline or light oil compression control device that adjusts the compression rate of gasoline or light oil based on the type of gasoline or light oil detected by the liquid type detection device is provided.
- the method for reducing automobile exhaust gas of the present invention is a method for reducing automobile exhaust gas.
- the type of gasoline or light oil in gasoline in the fuel tank or upstream or downstream of the fuel pump is detected, and gasoline or gasoline detected by the liquid type detection device is detected. It is characterized by adjusting the compression ratio of gasoline based on the type of light oil.
- the compression ratio of gasoline or light oil can be adjusted based on the detection result of the type of gasoline or light oil, so that appropriate compression of gasoline or light oil can be performed according to the type of gasoline. Rate can be obtained.
- the vehicle exhaust gas reducing device of the present invention is a vehicle exhaust gas reducing device
- a urea solution supply mechanism for supplying a urea solution upstream of the catalyst device, wherein the urea solution supply mechanism stores a urea solution, a urea solution tank, and a urea pump.
- a urea spray device for spraying a urea solution sent from a urea pump upstream of the catalyst device.
- the liquid type detecting device for the above-mentioned (1) or (2) is disposed in the urea tank or upstream or downstream of the urea pump.
- the method for reducing automobile exhaust gas of the present invention is a method for reducing automobile exhaust gas
- a urea solution supply mechanism configured by a urea solution tank that stores a urea solution, a urea pump, and a urea spray device that sprays the urea solution fed from the urea pump upstream of the catalyst device. Supply the urea solution upstream of the
- the urea concentration of the urea solution in the urea tank or on the upstream or downstream side of the urea pump is detected by using any one of the liquid type detection methods described above.
- the urea concentration of the urea solution in the urea tank can be maintained at a predetermined concentration, and therefore, N ⁇ x in the exhaust gas can be reduced and extremely reduced.
- the sub-flow path on-off valve is closed, and the fluid to be detected is discharged at the flow rate
- the sub flow path opening / closing valve is opened, and the fluid to be detected is allowed to flow through the flow rate sensor device to detect the flow rate. be able to.
- the system is compact. For example, if it is applied to an automobile system, the whole system can be made compact. Further, according to the present invention, by arranging a check valve on the downstream side of the flow rate of the sub flow path ′ liquid type detection sensor device, for example, the type of a pump which is a liquid sending device for flowing a fluid, When a pulsating flow occurs and a backflow occurs depending on the type of the drive system, the backflow can be suppressed.
- the backflow of the fluid in the flow rate / liquid type detection sensor device can be prevented, so that the liquid type detection, the concentration detection, and the flow rate detection are not affected by the backflow of the fluid.
- the fluid to be detected flows through the sub-flow path by closing the main flow path opening / closing valve, and the flow rate is detected by the liquid type detection sensor device. In this way, the flow rate of the fluid necessary for detection can be secured.
- the main flow path opening / closing valve is opened so that the fluid flows through the main flow path, thereby reducing the flow rate of the fluid flowing through the sub flow path.
- the flow rate of the fluid required for detection by the liquid type detection sensor device can be secured.
- the orifice is provided in the main flow path, when the fluid hardly flows in the sub flow path where the pressure loss in the main flow path is small, the orifice is used for the main flow path. Pressure loss can be increased, whereby a certain flow rate of fluid required for detection can flow in the sub-flow path, and the above-described detection can be performed reliably. .
- the present invention when the introduction of the fluid to be detected into the liquid type detection device main body is stopped and the detected fluid is temporarily retained in the liquid type detection chamber, The flow of the fluid to be detected is suppressed by the flow control plate, and the flow force of the fluid to be detected around the liquid type detection sensor located inside the flow control plate surrounded by the flow control plate stops instantaneously. become.
- the liquid type detection chamber is provided, the amount of stagnation of the liquid to be detected increases, so that when detecting the liquid type and concentration of the liquid to be detected, the influence of ambient temperature and other external influences is detected. Accurate detection can be performed without being performed.
- the fluid to be detected is introduced into the flow control plate surrounded by the flow control plate from the fluid inlet of the liquid type detection chamber via the fluid inlet of the flow control plate.
- the liquid is surely penetrated around the liquid type detection sensor located inside the flow control plate, and the liquid type and concentration of the fluid to be detected can be detected by the liquid type detection sensor.
- the detected liquid is detected from the fluid outlet of the liquid type detection chamber through the fluid outlet of the flow control plate. Since the fluid to be detected can be reliably discharged, it is possible to sequentially and accurately detect the fluid to be detected.
- the fluid inlet of the liquid type detection chamber and the fluid inlet of the flow control plate are separated from each other by a predetermined distance, air mixed with the fluid to be detected from these gaps is The liquid moves to the outside of the flow control plate and is discharged to the outside from the fluid discharge port of the liquid type detection chamber.
- the side wall near the fluid discharge port of the liquid type detection chamber is formed in a substantially circular arc shape, the side wall of the substantially circular arc type liquid type detection chamber is covered along the side wall. The air mixed with the detection fluid is guided to the fluid outlet of the liquid type detection chamber and discharged.
- the liquid type detection chamber has a substantially tubular side wall, and the fluid introduction port and the fluid discharge port of the liquid type detection chamber are formed so as to face the side wall. Therefore, air entering from the fluid inlet of the liquid type detection chamber is guided to the outside along the substantially arc-shaped side wall near the fluid inlet of the liquid type detection chamber. Air does not enter the flow control plate through the fluid inlet.
- the air mixed into the detected fluid is guided to the inside toward the fluid discharge port along the substantially arc-shaped side wall near the fluid discharge port of the liquid type detection chamber.
- the liquid is guided and discharged to the fluid discharge port of the liquid type detection chamber.
- the present invention since a heat insulating member is interposed between the liquid type detection device main body and the liquid type detection chamber, the influence of the outside air temperature, the effect of external vibration, Influence of external noise such as electromagnetic waves on the liquid The detection of the liquid inside the liquid type detection chamber and the liquid type detection sensor are not affected, so the accurate detection of the liquid type and concentration of the detected liquid is always performed. It can be performed.
- This heat insulation member can prevent the sensor from being affected by vibrations during traveling, impacts from stone splashes, etc., and can always accurately detect the liquid type and concentration of the fluid to be detected. it can.
- the type of fluid can be accurately and quickly determined. It is possible to detect the concentration and the flow rate of the fluid.
- the voltage output difference V0 can be accurately obtained based on the average value of a predetermined number of samplings with respect to the applied voltage of one pulse. It is possible to detect the type, concentration, and fluid flow rate.
- the voltage output obtained for the fluid to be detected based on the calibration curve data which is the correlation of the voltage output difference with respect to temperature for the predetermined reference fluid stored in advance Since the type, concentration and flow rate of the fluid are detected based on the difference V0, the type, concentration and flow rate of the fluid can be detected more accurately and quickly.
- the voltage output Vout for the voltage output difference V0 at the measurement temperature of the fluid to be detected is correlated with the output voltage for the voltage output difference at the measurement temperature of the predetermined threshold reference fluid.
- the correction makes it possible to eliminate the influence of the voltage output difference V0 due to the temperature and to more accurately correlate the voltage output Vout with the gasoline property. Flow rate can be detected.
- the flow rate 'liquid type detection sensor heater is a laminated flow rate' liquid type detection sensor in which a heater and a flow rate-liquid type detection liquid temperature sensor are laminated via an insulating layer. Since it is a single heater, there is no mechanical part that performs mechanical operations.Therefore, the type, concentration, and flow rate of the fluid can be accurately and quickly determined without causing deterioration due to aging or foreign matter in the fluid. Can be detected.
- the sensor unit can be configured to be extremely small, so that it is possible to detect the type, concentration, and flow rate of the fluid with extremely good thermal responsiveness and accurately.
- the heater of the liquid type detection sensor heater and the liquid type detection liquid temperature sensor are configured so as to be in contact with the fluid to be detected via metal fins, respectively. Therefore, the heater of the flow rate 'liquid type detection sensor heater and the flow rate' liquid type detection liquid temperature sensor do not directly contact the fluid to be detected, which may cause deterioration over time or malfunction due to foreign matter in the fluid. The type, concentration, and flow rate of the fluid can be detected accurately and quickly.
- the liquid temperature sensor since the liquid temperature sensor is configured to come into contact with the fluid to be detected via the metal fins, the liquid temperature sensor does not directly contact the fluid to be detected. It is possible to accurately and quickly detect the type and concentration of the fluid and the flow rate of the fluid without causing deterioration due to aging or foreign matter in the fluid.
- the present invention it is possible to accurately and quickly detect the flow rate and type of gasoline or light oil in an automobile, and to set the ignition timing based on the detection result of the flow rate and type of gasoline or light oil. Therefore, appropriate ignition timing can be obtained according to the flow rate and type of gasoline or light oil.
- the urea concentration of the urea solution in the urea tank can be maintained at a predetermined concentration. It is an extremely excellent invention that has many remarkable and unique effects, such as being able to reduce N ⁇ x in exhaust gas to an extremely low level.
- reference numeral 1 denotes a flow rate 'liquid type detection device of the present invention as a whole.
- the flow rate / liquid type detection device 1 includes a main flow path 2 through which a detection target fluid such as gasoline, light oil, and urea solution flows.
- a sub flow path 3 is provided branching from the main flow path 2.
- the sub flow path 3 is provided with a flow rate / liquid type detection sensor device 10, and an upstream side thereof is a sub flow path that controls the flow rate of the fluid to be detected to the liquid type detection sensor device 10.
- An open / close valve 5 is provided.
- the sub flow path 3 includes a flow rate 'liquid type detection sensor device 1
- a check valve 6 On the downstream side of 0, a check valve 6 is provided.
- the main flow path 2 is provided with a main flow path opening / closing valve 7 for controlling the flow of the fluid to be detected to the main flow path, and an orifice 8 is provided downstream thereof.
- a sensor control device 9 including a communication device for controlling 7 is provided.
- this sensor control device 9 includes an ECU (engine
- control unit) 4 is connected.
- the sub flow path on-off valve 5 and the main flow path on-off valve 7 are not particularly limited, but for example, an electromagnetic valve or the like can be adopted.
- the orifice 8 is not particularly limited.
- a flange tap orifice, a variable orifice, an orifice having a plurality of thin tubes, and the like can be adopted.
- the thus configured flow rate / liquid type detection device 1 is operated as follows.
- the sensor control device 9 controls the sub flow path on-off valve 5 to open.
- the sub-flow path on-off valve 5 is closed, and the fluid to be detected is temporarily retained in the flow rate liquid type detection sensor device 10 to perform liquid type detection, concentration detection, or both. It is controlled.
- the sensor controller 9 (or the ECU 4) By controlling the sub flow path on-off valve 5, the detected fluid is caused to flow through the flow rate liquid type detection sensor device 10 and the flow rate is controlled in this state. ing.
- the sensor control device 9 (or the ECU 4) closes the main flow path on-off valve 7 when the flow rate of the detected fluid is small, and conversely, when the flow rate of the detected fluid is large,
- the main flow path opening / closing valve 7 is configured to be controlled to open.
- the fluid to be detected flows into the sub flow path 3 by closing the main flow path opening / closing valve 7, and the flow rate ′
- the flow rate of the fluid required for detection in the system can be secured.
- the flow rate of the fluid flowing through the sub flow path 3 is reduced, and the flow rate and the flow rate of the fluid are required to be detected by the liquid type detection sensor device 10. it can.
- the check valve 6 downstream of the flow rate of the sub flow path 3 and the liquid type detection sensor device 10, for example, the type of pump, which is a liquid sending device for flowing fluid, and the drive system In the case where a pulsating flow is generated and a backflow occurs depending on the type, the backflow can be suppressed.
- the orifice 8 is provided in the main flow path 2, the pressure loss in the main flow path 2 is small. The loss can be increased, whereby a certain amount of fluid required for detection can flow in the sub flow path 3, and detection can be performed reliably.
- the flow rate 'liquid type detection sensor device 10 of the present invention has a flow rate A liquid type detection sensor device main body 12, a first flow path 14 formed inside the liquid type detection sensor device main body 12, and a second flow path 16 are provided.
- the fluid flow inlet 18 is configured to temporarily stay in the liquid type detection chamber 20 via the first flow path 14.
- the flow rate / liquid type detection chamber 20 has a substantially track-shaped flow rate / liquid type detection sensor opening 22 at the upper portion thereof.
- a flow rate / liquid type detection sensor 24 is attached to the flow rate / liquid type detection sensor opening 22.
- the flow rate / liquid type detection sensor 24 is composed of a flow rate / liquid type detection sensor heater 25 and a liquid located at a certain distance from the flow rate / liquid type detection sensor heater 25.
- a temperature sensor 28 is provided.
- the flow rate / liquid type detection sensor heater 25, the liquid temperature sensor 28 and the force molding resin 30 are integrally formed.
- the flow rate 'liquid type detection sensor heater 25 includes a lead electrode.
- the flow rate 'liquid type detection sensor heater 25 has a flow rate from the mold resin 30.
- the flow rate' liquid type detection sensor opening 25 protrudes into the flow rate 'liquid type detection chamber 20 to directly communicate with the fluid to be detected.
- Metal fins 36 are provided for contact.
- the lead electrode 32, the thin-film chip portion 34, and the fin 36 are electrically connected to each other by a bonding wire 38.
- the liquid temperature sensor 28 also has the same configuration as the flow rate 'liquid type detection sensor heater 25, and includes a lead electrode 32, a thin film chip portion 34, a fin 36, and a bonding wire, respectively. It has 38.
- the thin-film chip portion 34 is formed, for example, from the substrate 40 having a high A1 strength and the Pt.
- a thin-film chip force is formed by sequentially laminating electrode pads 52 made of Au.
- the thin-film chip portion 34 of the liquid temperature sensor 28 has the same structure, but is configured so that only the temperature sensor (thermosensor) 42 is operated without operating the heater (heater) 46. ing.
- the flow rate 'liquid type detection sensor 24 detects the liquid type, concentration, and flow rate of the fluid to be detected. After the amount is detected, the detected fluid is discharged from the flow rate / liquid type detection chamber 20 to the outside from the second flow path 16 through the fluid discharge port 54.
- FIGS. 2 and 3 the circuit board member connected to the flow rate / liquid type detection sensor 24 is shown.
- a lid member for covering this is omitted.
- the flow rate / liquid type detection sensor device 10 of the present invention has a circuit configuration as shown in FIG.
- the applied voltage is controlled by the heater 74 of the heater 25 for the flow rate detecting liquid type detection sensor under the control of the computer 72.
- gasoline liquid type detection is performed as follows.
- the sub flow passage opening / closing valve 5 is opened, the sub flow passage opening / closing valve 5 is closed, and the flow rate of the liquid type detection sensor device 10 is controlled.
- the fluid to be detected flows in from the fluid inlet 18 of the first flow path 14 and temporarily stays in the flow rate liquid type detection chamber 20.
- the pulse voltage P is applied to the heater 74 of the flow rate 'liquid type detection sensor heater 25 for a predetermined time, and in the case of this embodiment, The voltage is applied for four seconds, and the temperature change of the analog output of the sensor unit 68 is measured as shown in FIG.
- the voltage difference of the sensor bridge circuit 68 before applying the pulse voltage P to the heater 74 of the flow rate 'liquid type detection sensor heater 25 is a predetermined number of times per second. In the case of the embodiment, sampling is performed 256 times, and the average value is used as the average initial voltage VI. The value of the average initial voltage VI corresponds to the initial temperature of the flow rate 'liquid type detection liquid temperature sensor 26. Then, as shown in FIG. 8, a predetermined pulse voltage P, in this embodiment, a voltage of 10 V, is applied to the heater 74 of the flow rate 'liquid type detection sensor heater 25 for 4 seconds.
- This average peak voltage V2 corresponds to the peak temperature of the liquid temperature sensor 26 for flow rate / liquid type detection.
- V0 V2-V1
- the computer 72 performs a proportional calculation based on the calibration curve data, and is configured to detect the type of gasoline based on the voltage output difference V0 obtained for the detected fluid.
- the voltage output Vout for the voltage output difference V0 at the measured temperature T of the fluid to be detected is changed to a predetermined threshold reference fluid (in this embodiment, gasoline A2 and gasoline A2).
- ⁇ ⁇ 7) is corrected in relation to the output voltage for the voltage output difference at the measured temperature.
- the liquid type output of the threshold reference fluid at this time is set to a predetermined voltage, that is, in this embodiment, the liquid type output of gasoline A2 Assuming that the voltage output of the fluid to be detected Vout is 3.5 V and the output of the liquid type of gasoline No. 7 is 0.5 V, the properties of gasoline can be correlated.
- the pulse width (pulse application time) is set so that the fluid to be detected stays in the case of liquid type detection and concentration detection, so that the fluid is not excessively heated. , Preferably less than 5 seconds.
- the flow rate can be detected if it is 1 second or more.
- the above gasoline liquid type detection method uses the principle that the kinematic viscosity of gasoline and the sensor output have a correlation using natural convection.
- the flow rate 'liquid type detection sensor device 10 detects gasoline flow rate, for example, as follows.
- the sub flow path opening / closing valve 5 When detecting the flow rate of the fluid to be detected, the sub flow path opening / closing valve 5 is opened under the control of the sensor control device 9 or ECU 4), and the first flow rate of the flow rate
- the fluid to be detected flows in from the fluid inlet 18 of the passage 14 and is discharged from the flow rate / liquid type detection chamber 20 to the outside through the fluid outlet 54 through the second flow passage 16, and the fluid to be detected is Flow through the liquid flow rate detection sensor device 10.
- the voltage output Vout of the fluid to be detected is obtained in the same manner as in the liquid type detection described above, and based on the calibration curve data on the flow rate measured in advance as shown in FIG. 11, By comparing the data with the data stored in the computer 72, it becomes possible to accurately and quickly (instantly) detect the flow rate of gasoline.
- the calibration curve data shown in Fig. 11 shows an example of the results of measurement of a commercial high-octane gasoline using a commercially available flow meter using a measuring device as shown in Fig. 12. It is.
- the flow rate is 0 to 180 liters / hour
- the conditions for the flow rate 'liquid type detection sensor device 10 are a pulse time of 35 seconds, preferably 4 seconds, and a pulse voltage of 10 V ( (Equivalent to 250 mV), preferably for 512 seconds and a temperature of 80 ° C.
- V Pulsed to 250 mV
- the voltage output Vout is obtained in the same manner as in the above-described liquid type detection, so that the property is correlated with the urea property. I can do it.
- reference numeral 10 denotes the whole liquid type detection device of the present invention. Liquid type detection device
- Reference numeral 10 includes a substantially box-shaped liquid type detection device main body 12 through which a detection target fluid such as gasoline, light oil, or urea solution flows.
- a detection target fluid such as gasoline, light oil, or urea solution flows.
- Fig. 20 is an exploded perspective view of the entire liquid type detection device of the present invention
- Fig. 21 is an exploded perspective view of a liquid type detection chamber of the liquid type detection device of the present invention.
- liquid type detection device of this embodiment uses the flow rates shown in Figs. 3 to 10 described above.
- liquid type detection sensor device 10 • Basically, the same components are used as the liquid type detection sensor device 10, and the flow rate and the liquid type detection sensor device 10 shown in FIGS. This will be described in detail below in place of “liquid type detection”.
- the liquid type detection device main body 12 is provided therein with a substantially cylindrical liquid type detection chamber 20.
- the liquid type detection device main body 12 has a first flow path 14 and a first flow path 14.
- the first flow path 14 is connected to a fluid inlet 18 provided in the liquid type detection chamber 20. Further, the second flow path 16 is connected to the fluid discharge port 11 provided in the liquid type detection chamber 20.
- the detected fluid introduced into the liquid type detection device main body 12 passes through the fluid introduction port 18 from the first flow path 14 and passes through the liquid type detection chamber 20. It is configured to temporarily stay in the area.
- the liquid type detection chamber 20 is provided with a liquid type detection chamber cover 21 on the upper portion thereof, and the liquid type detection chamber cover 21 is provided with a substantially track-shaped liquid type detection sensor. An opening 22 is formed. [0237] The liquid type detection sensor 24 is mounted in the liquid type detection sensor opening 22, as shown in FIG.
- the liquid type detection sensor 24 includes a liquid type detection sensor heater 25, and a liquid temperature sensor 28 disposed at a certain distance from the liquid type detection sensor heater 25. ing.
- the liquid type detection sensor heater 25 and the liquid temperature sensor 28 are integrally formed by a mold resin 30.
- the liquid type detection sensor heater 25 includes a lead electrode 32 and a thin film chip portion.
- the liquid type detection sensor heater 25 projects from the mold resin 30 through the liquid type detection sensor opening 22 into the liquid type detection chamber 20, and is made of a metal material that comes into direct contact with the fluid to be detected. It has fins 36.
- the lead electrode 32, the thin film chip portion 34, and the fin 36 are electrically connected to each other by a bonding wire 38.
- the liquid temperature sensor 28 has the same configuration as the liquid type detection sensor heater 25, and includes a lead electrode 32, a thin film chip portion 34, a fin 36, and a bonding wire 38, respectively. ing.
- the thin-film chip portion 34 is formed, for example, from the substrate 40 with A1 strength and Pt.
- a thin-film chip force is formed by sequentially laminating electrode pads 52 made of Au.
- the thin film chip portion 34 of the liquid temperature sensor 28 has the same structure, but is configured so that only the temperature sensor (thermosensor) 42 is operated without operating the heater 46 (heater). ing.
- the detection target fluid flows from the liquid type detection chamber 20 to the fluid discharge port 11 of the liquid type detection chamber 20. It is discharged to the outside through the second channel 16.
- the liquid type detection sensor 24 includes a circuit board member 23 and an outer lid member 27 that covers the circuit board member 23. 21 and 3, the circuit board member 23 and the outer lid member 27 are omitted for convenience of description.
- reference numerals 12a and 12b denote mounting flanges provided on the liquid type detecting device main body 12, for mounting the liquid type detecting device 10 on, for example, an automobile.
- the flow control plate 1 is provided in the liquid type detection chamber 20 so as to surround the liquid type detection sensor 24 protruding into the liquid type detection chamber 20. It is formed inside the detection chamber lid member 21.
- the flow control plate 1 is composed of a plate member 2 having a substantially U-shaped cross section.
- the plate member 2 surrounds the liquid type detection sensor 24 from both sides, and has a fluid introduction port of the liquid type detection chamber 20.
- a pair of side plate members 3 and 4 extending from 18 toward the fluid discharge port 11 and a cover plate member 5 connected to these side plate members 3 and 4 are provided.
- the flow control plate 1 has a fluid inlet 6 facing the fluid inlet 18 of the liquid type detection chamber 20, and a fluid outlet 7 facing the fluid outlet 11 of the liquid type detection chamber 20. Is formed
- the fluid inlet 18 of the liquid type detection chamber 20 and the fluid inlet 6 of the flow control plate 1 are separated from each other by a predetermined distance Ll,
- the fluid outlet 7 of the control plate 1 is separated from the force S by a predetermined distance L2.
- the fluid to be detected is introduced into the flow control plate 1 surrounded by the flow control plate 1 from the fluid inlet 18 of the liquid type detection chamber 20 through the fluid inlet 6 of the flow control plate 1.
- the liquid can reliably enter the periphery of the liquid type detection sensor 24 located inside the flow control plate 1, and the liquid type detection sensor 24 can detect the liquid type and concentration of the fluid to be detected.
- the fluid outlet of the liquid type detection chamber 20 is passed through the fluid outlet 7 of the flow control plate 1. From step 11, the fluid to be detected after the detection can be reliably discharged, so that the detection of the fluid to be detected can be performed sequentially and accurately. [0253] Therefore, when the liquid type and concentration are detected by the liquid type detection sensor 24, the flow of the detected fluid does not occur, and the detected fluid is not disturbed by vibration. The influence on the detection of the liquid type and concentration can be prevented, and the liquid type and concentration of the fluid to be detected can be accurately measured.
- the liquid type detection chamber 20 is provided, the amount of stagnation of the liquid to be detected is increased. Accurate detection can be performed without being affected.
- the fluid in the liquid type detection chamber 20 passes through the fluid outlet 7 of the aerodynamic flow control plate 1 mixed with the fluid to be detected. Since this air can be reliably discharged from the discharge port 11, the air does not stay around the liquid type detection sensor 24, so that the influence on the detection can be prevented and accurate detection can be performed. be able to.
- the fluid inlet 18 of the liquid type detection chamber 20 is separated from the fluid inlet 6 of the flow control plate 1 by a predetermined distance Ll as described above, as shown by an arrow A in FIG. From these gaps, the air mixed with the fluid to be detected moves to the outside of the flow control plate 1 and is discharged outside from the fluid discharge port 11 of the liquid type detection chamber 20.
- the side wall near the fluid outlet 11 of the liquid type detection chamber 20 has a substantially circular tube shape and is formed in a substantially circular arc shape.
- the aerodynamic force mixed with the fluid to be detected is guided inward to the fluid discharge outlet 11 of the liquid type detection chamber 20, and is discharged.
- the predetermined distances Ll and L2 are set to 1.5 mm to 5 mm, preferably 2 mm to 3.5 mm. Desirable les ,. Further, it is desirable that the distance L3 between the pair of side plate members 3 and 4 of the flow control plate 1 and the liquid type detection sensor 24 be 5 mm to 10 mm, preferably 6 mm to 8 mm.
- the size of the liquid type detection chamber 20 is not particularly limited.
- the material constituting the liquid type detection chamber 20 is not particularly limited, but may be a metal such as stainless steel such as SUS304, a synthetic resin such as polyacetal (POM), or a fiber reinforced resin such as FRP. Etc. can be used.
- the material of the flow control plate 1 is not particularly limited, but may be a metal such as stainless steel such as SUS 304, a synthetic resin such as polyacetal (POM), or a fiber reinforced material such as FRP. Resin, ceramic, etc. can be used.
- a metal such as stainless steel such as SUS 304
- a synthetic resin such as polyacetal (POM)
- a fiber reinforced material such as FRP. Resin, ceramic, etc. can be used.
- liquid type detection device 10 of the present invention has a circuit configuration as shown in FIG.
- the liquid type detection sensor 24 of the liquid type detection sensor 24, the liquid type sensor 26 for detecting the liquid type of the heater 25, and the liquid temperature sensor 28 are connected via two resistors 64, 66 to form a bridge.
- the circuit 68 is configured. Then, the output of the bridge circuit 68 is connected to the input of the amplifier 70, and the output of the amplifier 70 is connected to the input of the computer 72 constituting the detection control section.
- the voltage applied to the heater 74 of the liquid type detection sensor heater 25 is controlled by the computer 72.
- liquid type detection device 10 configured as described above, for example, gasoline liquid type detection is performed as follows.
- the fluid to be detected is introduced into the liquid type detection device main body 12 by the control of a control device (not shown). After the detection fluid is caused to flow, the flow of the detected fluid is stopped, so that the detection fluid is temporarily retained in the liquid type detection chamber 20.
- the pulse voltage P is applied to the heater 74 of the liquid type detection sensor heater 25 for a predetermined time, and in this embodiment, Is applied for 4 seconds, and the temperature change of the analog output of the sensor unit bridge circuit 68 is measured as shown in FIG.
- the voltage difference of the sensor bridge circuit 68 before the pulse voltage P is applied to the heater 74 of the liquid type detection sensor heater 25 is increased a predetermined number of times per second.
- sampling is performed 256 times, and the average value is set as the average initial voltage VI.
- the value of the average initial voltage VI corresponds to the initial temperature of the liquid type detection liquid temperature sensor 26.
- a predetermined pulse voltage P in this embodiment, a voltage of 10 V
- a predetermined time in this embodiment, a value obtained by sampling the peak voltage a predetermined number of times in one second from three seconds later, in this embodiment, 256 times is set as the average peak voltage V2.
- This average peak voltage V2 corresponds to the peak temperature of the liquid type detection liquid temperature sensor 26.
- V0 V2-V1
- the computer 72 performs a proportional calculation based on the calibration curve data, and is configured to detect the type of gasoline based on the voltage output difference V0 obtained for the detected fluid.
- the voltage output Vout for V0 is corrected by correlating it with the output voltage for the voltage output difference at a measured temperature for a predetermined threshold reference fluid (in this embodiment, gasoline A2 and gasoline No. 7). I have.
- the liquid type output of the threshold reference fluid at this time is set to a predetermined voltage, that is, in this embodiment, the liquid type output of gasoline A2 The 3.5V, gasoline
- gasoline liquid type detection can be performed accurately and quickly (instantaneously).
- the pulse width (pulse application time) is set so that the fluid to be detected stays in the case of liquid type detection and concentration detection, so that the fluid is not excessively heated.
- the flow rate can be detected if it is 1 second or more.
- the gasoline liquid type detection method described above uses the principle that the kinematic viscosity of gasoline and the sensor output have a correlation using natural convection.
- FIG. 23 is a perspective view showing another embodiment of the liquid type detection device of the present invention.
- the liquid type detection device 10 of this embodiment has basically the same configuration as the liquid type detection device 10 of the embodiment shown in FIG. 20, and the same components are denoted by the same reference numerals. Detailed explanations of these are omitted.
- the heat insulating member 8 is interposed between the liquid type detection device main body 12 and the liquid type detection chamber 20.
- the heat insulating member 8 is not particularly limited.
- foamed synthetic resins such as polyethylene, polypropylene, and urethane, glass wool, and the like can be used.
- FIG. 14 is a schematic diagram similar to FIG. 17, showing an embodiment in which the flow rate / liquid type detection device 1 configured as described above is applied to an automobile system.
- the same components as those in FIG. 17 are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the flow rate / liquid type detection device 1 as shown in Fig. 1 and Fig. 2 is arranged in the fuel tank 108 or on the upstream side of the fuel pump 110.
- the liquid type detection device 10 as shown in Fig. 20 and Fig. 21 is provided in the fuel tank 108 or on the upstream side of the fuel pump 110.
- the flow rate 'liquid type detection device 1 detects gasoline in the fuel tank 108 or upstream or downstream of the fuel pump 110 (in this embodiment, for convenience of explanation, the case of upstream gasoline is shown).
- the ignition timing is controlled by the ignition timing control unit 122 under the control of the control unit 120 according to the type of gasoline by detecting the liquid type and flow rate.
- the liquid type detection device 10 allows the gasoline in the fuel tank 108 or upstream or downstream of the fuel pump 110 (for the sake of convenience of explanation, the case of the upstream is shown).
- the ignition timing is adjusted by the ignition timing control device 122 under the control of the control device 120 according to the type of gasoline by detecting the liquid type.
- Fig. 15 is a schematic diagram similar to Fig. 17 showing an embodiment in which the flow rate / liquid type detection device 1 configured as described above is applied to an automobile system.
- the flow rate / liquid type detection device 1 as shown in Fig. 1 and Fig. 2 is arranged in the fuel tank 108 or on the upstream side of the fuel pump 110.
- a liquid type detection device 10 as shown in Figs. 20 and 21 is provided in the fuel tank 108 or on the upstream side of the fuel pump 110.
- the flow rate 'liquid type detection device 1 allows the gasoline in the fuel tank 108 or the upstream or downstream of the fuel pump 110 (for convenience of explanation, the case of the upstream is shown for convenience of explanation).
- the gasoline compression ratio is adjusted by the gasoline compression control device 124 under the control of the control device 120 according to the type of gasoline by detecting the liquid type and flow rate.
- the liquid type detection device 10 allows the gasoline in the fuel tank 108 or the upstream or downstream of the fuel pump 110 (for the sake of convenience of explanation, the case of the upstream is shown).
- the gasoline compression ratio is adjusted by the gasoline compression control device 124 by controlling the control device 120 according to the type of gasoline by detecting the liquid type of the gasoline.
- FIG. 16 is a schematic diagram similar to FIG. 19, showing an embodiment in which the thus configured flow rate type liquid type detecting device 1 is applied to an automobile system using a urea solution.
- the flow rate / liquid type detection device 1 as shown in Figs. 1 and 2 is provided in the urea solution tank 132 or on the upstream side of the urea pump 134.
- the flow rate / liquid type detection device 1 allows the urea solution in the urea solution tank 132 or the upstream or downstream of the urea pump 134 (in this embodiment, the case of the upstream is shown for convenience of explanation). Perform urea concentration discrimination of the solution,
- the concentration of the urea sprayed on the upstream side of the catalytic device 116 is increased without the urea solution solidifying.
- the urea is kept constant at 32.5% and the H 0 power is 7.5%.
- FIG. 21 A liquid type detection device 10 as shown in FIG. 21 can be provided.
- the liquid type detection device 10 allows the liquid type detection device 10 to operate the inside of the urea solution tank 132 or the upstream or downstream side of the urea pump 134 (in this embodiment, for convenience of explanation, the case of the upstream side is shown).
- the urea concentration of the urea solution is shown.
- the concentration of urea sprayed on the upstream side of the catalyst device 116 is adjusted to a value such that, for example, 32.5% urea, H 0
- the force is kept constant at 7.5%.
- the present invention is not limited to this.
- the pulse voltage P, the number of samplings, and the like can be appropriately changed.
- gasoline and urea solutions of an automobile system have been described.
- the present invention can be applied to a device for flowing an organic solution in which a substance is dissolved in a solvent, and also to detect the type, concentration, and flow rate of a fluid. It is possible.
- the present invention can detect, for example, the type, concentration, and flow rate of a fluid such as gasoline, light oil, or an organic solution in a plant, which is a fuel in an automobile.
- a fluid such as gasoline, light oil, or an organic solution in a plant, which is a fuel in an automobile.
- FIG. 1 is a schematic diagram of an embodiment of a flow rate / liquid type detection device of the present invention.
- FIG. 2 shows an embodiment of the flow rate 'flow rate of the liquid type detecting device' of the present invention.
- FIG. 4 is a schematic top view of an example.
- FIG. 3 is a cross-sectional view taken along line AA of FIG. 2.
- FIG. 4 is a partially enlarged cross-sectional view showing a mounted state of the flow rate / liquid type detection sensor of FIG.
- FIG. 5 is a cross-sectional view of a flow rate / liquid type detection sensor.
- FIG. 6 is a partially enlarged exploded perspective view showing a stacked state of a thin film chip portion of a flow rate 'liquid type detection sensor.
- FIG. 7 is a schematic circuit configuration diagram of an embodiment of a flow rate 'flow rate of liquid type detection device' of the present invention.
- FIG. 8 is a graph showing a time-voltage relationship showing a liquid type detection method using the flow rate / liquid type detection device of the present invention.
- FIG. 9 is a graph showing a calibration curve showing a liquid type detection method using the flow rate 'liquid type detection device of the present invention.
- FIG. 10 is a graph showing an output correction method of a liquid type detection method using the flow rate 'liquid type detection device of the present invention.
- FIG. 11 is a graph showing a calibration curve illustrating a flow rate detection method using the flow rate / liquid type detection device of the present invention.
- FIG. 12 is a schematic diagram of the entire measurement apparatus that obtained the calibration curve data shown in FIG.
- FIG. 13 is a graph showing a calibration curve showing a concentration detection method using the flow rate / liquid type detection device of the present invention.
- FIG. 14 is a schematic diagram similar to FIG. 17, showing an embodiment in which the flow rate / liquid type detecting device 1 and the liquid type detecting device 10 of the present invention are applied to an automobile system.
- FIG. 15 is a schematic diagram similar to FIG. 17, showing an embodiment in which the flow rate / liquid type detection device 1 and the liquid type detection device 10 of the present invention are applied to an automobile system.
- FIG. 16 is a schematic diagram similar to FIG. 19, showing an embodiment in which the flow rate / liquid type detecting device 1 and the liquid type detecting device 10 of the present invention are applied to an automobile system using a urea solution. .
- FIG. 17 is a schematic diagram of a conventional automobile system.
- FIG. 18 is a graph showing the distillation properties of gasoline.
- FIG. 19 is a schematic diagram of a conventional automobile system using a urea solution.
- FIG. 20 is an exploded perspective view of the entire liquid type detection device of the present invention.
- FIG. 21 is an exploded perspective view of a liquid type detection chamber of the liquid type detection device of the present invention.
- FIG. 22 is a schematic diagram illustrating a detection state of a liquid type detection chamber of the liquid type detection device of the present invention.
- FIG. 23 is a perspective view showing another embodiment of the liquid type detection device of the present invention. Explanation of symbols
- Ignition timing controller Gasoline compression controller Urea solution supply mechanism 132 Urea solution tank 134 Urea pump
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04747321.0A EP1653227B1 (en) | 2003-07-11 | 2004-07-09 | Device and method of detecting liquid kind |
CA002532209A CA2532209A1 (en) | 2003-07-11 | 2004-07-09 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
US10/564,331 US7377185B2 (en) | 2003-07-11 | 2004-07-09 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
US11/956,650 US7647844B2 (en) | 2003-07-11 | 2007-12-14 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003195694A JP2005030888A (ja) | 2003-07-11 | 2003-07-11 | 流量・液種検知装置および流量・液種検知方法 |
JP2003-195694 | 2003-07-11 | ||
JP2003201142A JP4278450B2 (ja) | 2003-07-24 | 2003-07-24 | 液種検知装置および液種検知方法 |
JP2003-201142 | 2003-07-24 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/564,331 A-371-Of-International US7377185B2 (en) | 2003-07-11 | 2004-07-09 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
US11/956,650 Continuation-In-Part US7647844B2 (en) | 2003-07-11 | 2007-12-14 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
Publications (1)
Publication Number | Publication Date |
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WO2005005971A1 true WO2005005971A1 (ja) | 2005-01-20 |
Family
ID=34067340
Family Applications (1)
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PCT/JP2004/009853 WO2005005971A1 (ja) | 2003-07-11 | 2004-07-09 | 流量・液種検知装置および流量・液種検知方法、ならびに、液種検知装置および液種検知方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7377185B2 (ja) |
EP (1) | EP1653227B1 (ja) |
CA (1) | CA2532209A1 (ja) |
WO (1) | WO2005005971A1 (ja) |
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US7499814B2 (en) | 2003-10-31 | 2009-03-03 | Nissan Diesel Motor Co., Ltd. | Apparatus for detecting concentration and remaining amount of liquid reducing agent |
US7587288B2 (en) | 2004-10-29 | 2009-09-08 | Nissan Diesel Motor Co., Ltd. | Condition discriminating apparatus for liquid reducing agent |
US7658093B2 (en) | 2003-10-27 | 2010-02-09 | Nissan Diesel Motor Co., Ltd. | Liquid discriminating apparatus and liquid discriminating method |
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US7647844B2 (en) * | 2003-07-11 | 2010-01-19 | Mitsui Mining & Smelting Co., Ltd. | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
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US7895890B2 (en) * | 2007-07-03 | 2011-03-01 | Van Ee William J | Liquid depth sensing and identification system |
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US11047722B2 (en) | 2013-12-17 | 2021-06-29 | International Business Machines Corporation | Computer based fluid flow velocity estimation from concentrations of a reacting constituent for products and services |
US20140208724A1 (en) * | 2014-03-28 | 2014-07-31 | Caterpillar Inc. | Aftertreatment system |
GB2533936B (en) | 2015-01-07 | 2017-10-25 | Homeserve Plc | Flow detection device |
GB201501935D0 (en) | 2015-02-05 | 2015-03-25 | Tooms Moore Consulting Ltd And Trow Consulting Ltd | Water flow analysis |
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US11541385B2 (en) * | 2018-07-06 | 2023-01-03 | Qorvo Us, Inc. | Methods of measuring hematocrit in fluidic channels including conductivity sensor |
JP7248455B2 (ja) * | 2019-03-04 | 2023-03-29 | アズビル株式会社 | 熱式流量計および流量補正方法 |
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Also Published As
Publication number | Publication date |
---|---|
EP1653227B1 (en) | 2017-10-25 |
CA2532209A1 (en) | 2005-01-20 |
EP1653227A1 (en) | 2006-05-03 |
US7377185B2 (en) | 2008-05-27 |
EP1653227A4 (en) | 2012-12-05 |
US20060213263A1 (en) | 2006-09-28 |
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